Chapter XIII

Diseases of the musculoskeletal system and connective tissue
(M00-M99)

Excludes: certain conditions originating in the perinatal period ( P00-P96 )
certain disorders of the temporomandibular joint ( K07.6 )
certain infectious and parasitic diseases ( A00-B99 )
compartment syndrome ( T79.6 )
complications of pregnancy, childbirth and the puerperium ( O00-O99 )
congenital malformations, deformations and chromosomal abnormalities ( Q00-Q99 )
endocrine, nutritional and metabolic diseases ( E00-E90 )
injury, poisoning and certain other consequences of external causes ( S00-T98 )
neoplasms ( C00-D48 )
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified ( R00-R99 )

This chapter contains the following blocks:
M00-M25 Arthropathies
M00-M03 Infectious arthropathies
M05-M14 Inflammatory polyarthropathies
M15-M19 Arthrosis
M20-M25 Other joint disorders
M30-M36 Systemic connective tissue disorders
M40-M54 Dorsopathies
M40-M43 Deforming dorsopathies
M45-M49 Spondylopathies
M50-M54 Other dorsopathies
M60-M79 Soft tissue disorders
M60-M63 Disorders of muscles
M65-M68 Disorders of synovium and tendon
M70-M79 Other soft tissue disorders
M80-M94 Osteopathies and chondropathies
M80-M85 Disorders of bone density and structure
M86-M90 Other osteopathies
M91-M94 Chondropathies
M95-M99 Other disorders of the musculoskeletal system and connective tissue

Asterisk categories for this chapter are provided as follows:
M01* Direct infections of joint in infectious and parasitic diseases classified elsewhere
M03* Postinfective and reactive arthropathies in diseases classified elsewhere
M07* Psoriatic and enteropathic arthropathies
M09* Juvenile arthritis in diseases classified elsewhere
M14* Arthropathies in other diseases classified elsewhere
M36* Systemic disorders of connective tissue in diseases classified elsewhere
M49* Spondylopathies in diseases classified elsewhere
M63* Disorders of muscle in diseases classified elsewhere
M68* Disorders of synovium and tendon in diseases classified elsewhere
M73* Soft tissue disorders in diseases classified elsewhere
M82* Osteoporosis in diseases classified elsewhere
M90* Osteopathies in diseases classified elsewhere
Site of musculoskeletal involvement

The following subclassification to indicate the site of involvement is provided for optional use with appropriate categories in Chapter XIII. As local extensions or specialty adaptations may vary in the number of characters used, it is suggested that the supplementary site subclassification be placed in an identifiably separate position (e.g. in an additional box). Different sub-classifications for use with derangement of knee, dorsopathies, and biomechanical lesions not elsewhere classified are given at M23, before M40 and at M99 respectively.

0 Multiple sites
1 Shoulder region
clavicle
scapula
acromioclavicular
glenohumeral
sternoclavicular
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joints
2 Upper arm
humerus
elbow joint
3 Forearm
radius
ulna
wrist joint
4 Hand
carpus
fingers
metacarpus
joints between these bones
5 Pelvic region and thigh
buttock
femur
pelvis
hip (joint)
sacroiliac joint
6 Lower leg
fibula
knee joint
tibia
7 Ankle and foot
metatarsus
tarsus
toes
ankle joint
other joints in foot
8 Other
head
neck
ribs
skull
trunk
vertebral column
9 Site unspecified